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      1 //===- IPDBEnumChildren.h - base interface for child enumerator -*- C++ -*-===//
      2 //
      3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
      4 // See https://llvm.org/LICENSE.txt for license information.
      5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
      6 //
      7 //===----------------------------------------------------------------------===//
      8 
      9 #ifndef LLVM_DEBUGINFO_PDB_IPDBENUMCHILDREN_H
     10 #define LLVM_DEBUGINFO_PDB_IPDBENUMCHILDREN_H
     11 
     12 #include <cassert>
     13 #include <cstdint>
     14 #include <memory>
     15 
     16 namespace llvm {
     17 namespace pdb {
     18 
     19 template <typename ChildType> class IPDBEnumChildren {
     20 public:
     21   using ChildTypePtr = std::unique_ptr<ChildType>;
     22   using MyType = IPDBEnumChildren<ChildType>;
     23 
     24   virtual ~IPDBEnumChildren() = default;
     25 
     26   virtual uint32_t getChildCount() const = 0;
     27   virtual ChildTypePtr getChildAtIndex(uint32_t Index) const = 0;
     28   virtual ChildTypePtr getNext() = 0;
     29   virtual void reset() = 0;
     30 };
     31 
     32 template <typename ChildType>
     33 class NullEnumerator : public IPDBEnumChildren<ChildType> {
     34   virtual uint32_t getChildCount() const override { return 0; }
     35   virtual std::unique_ptr<ChildType>
     36   getChildAtIndex(uint32_t Index) const override {
     37     return nullptr;
     38   }
     39   virtual std::unique_ptr<ChildType> getNext() override {
     40     return nullptr;
     41   }
     42   virtual void reset() override {}
     43 };
     44 
     45 } // end namespace pdb
     46 } // end namespace llvm
     47 
     48 #endif // LLVM_DEBUGINFO_PDB_IPDBENUMCHILDREN_H
     49